Installation of Java on Windows

1. Download Java:

   • Go to https://www.oracle.com/java/technologies/javase-downloads.html.
   • Select Windows and click Download (typically the JDK).

2. Start Installation:

   • Run the downloaded .exe file.
   • Click Next and follow the instructions in the wizard.

3. Set Environment Variable (Path):

   • After installation, go to Control Panel → System and Security → System → Advanced System Setting.
   • Select Environment Variables.
   • Find Path under System variables.
   • Add your Java’s bin directory (for example: C:\Program Files\Java\jdk-17\bin) to Path.

4. Verify Installation:

   • Open cmd or PowerShell.

   • Type:

     java -version
     

   • It should show the installed Java version.

Installation of Java on Mac

1. Download Java:

   • Visit https://www.oracle.com/java/technologies/javase-downloads.html.
   • Select macOS and click Download (JDK .dmg).

2. Start Installation:

   • Open downloaded .dmg.
   • Double-click JDK.pkg.
   • Follow the instructions in the installation wizard.

3. Set Environment Variable (Path) (optional if not automatic):

   • Open ~/.zshrc or ~/.bash_profile.

   • Add:

     export JAVA_HOME=$(/usr/libexec/java_home)
     export PATH=$JAVA_HOME/bin:$PATH
     

   • Reload:

     source .zshrc
     

4. Verify Installation:

   java -version
   

   • Prints the installed Java version.

Installation of Java on Ubuntu

1. Open terminal.

2. Update package index first:

   sudo apt update
   

3. Installing Java (OpenJDK is recommended):

   sudo apt install default-jdk
   

   or for a specific version:

   sudo apt install openjdk-17-jdk
   

4. Verify Installation:

   java -version
   

   • Prints the installed Java version.